In studies of attractiveness, researchers have found that average faces—those with the most conventional traits—are rated as the most attractive. Such studies often use composite photography, a tool developed in the 19th century by Sir Francis Galton, who believed that he could use composite images to identify “types” by facial appearance. Hypothesizing that certain types have similar facial features, he began creating composite photos of the faces of criminals and vegetarians. What did he find? Discuss